[Repo Assist] Make Http.AppendQueryToUrl public

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🤖 This is an automated pull request from Repo Assist, an AI assistant for this repository.

Implements the request in #1325 — exposes Http.AppendQueryToUrl as a public API so callers can build query strings with correct percent-encoding without replicating the logic themselves.

Change

Remove the internal modifier from Http.AppendQueryToUrl in Http.fs. The implementation is unchanged; it was already well-tested via its internal use in Http.InnerRequest and WorldBankRuntime.

Usage

open FSharp.Data

let url = Http.AppendQueryToUrl("(api.example.com/redacted), [ "q", "hello world"; "page", "2" ])
// => "(api.example.com/redacted)

// Also handles URLs that already have a query string:
let url2 = Http.AppendQueryToUrl("(api.example.com/redacted), [ "q", "test" ])
// => "(api.example.com/redacted)

Test Status

✅ Build: successful
✅ 5 new unit tests added and passing (AppendQueryToUrl — no params, single param, multiple params, existing query string, special character encoding)
✅ All existing FSharp.Data.Core.Tests pass

Closes #1325

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